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The chemical composition of high-energy lithium battery, such as silicon, lithium metal and sulfur, can promote the transformation from fossil fuel to renewable energy (solar energy and wind energy). The capacity of silicon is more than 10 times that of traditional battery materials. However, during charging and discharging, the silicon material will break and lose electrical contact, which will make the broken particles lose their activity and cause the silicon battery to be unable to be recharged.

In 2013, Li Yuzhang began to study materials science and engineering at Stanford University. His first research project was materials of graphene and silicon. "Because the research project must use the electron microscope to observe the atomic layer of graphene and other materials, I have accumulated a lot of operating experience. Not everyone can use the electron microscope well, so I have invested a year or two before that to learn to operate the instrument skillfully."

The project began with Li Yuzhang's extensive research on how silicon cells fail. Silicon particles are low-cost substitutes. But unlike silicon nanoparticles, silicon particles suffer inevitable particle breakage in the electrochemical cycle, so it is difficult to achieve a stable cycle in practical batteries.

Therefore, Li Yuzhang and his team studied a method to encapsulate silicon particles (about 1-3 μ m) Method. The graphene cage acts as a soft buffer film with high mechanical strength during the cyclic charging process. Even if the particles expand and break in the cage, it can maintain electrical continuity at the particle and electrode levels. In addition, the chemically inert graphene cage forms a stable solid electrolyte interface, thereby minimizing irreversible lithium ion consumption, and rapidly improving the coulomb efficiency in the early cycle.

Li Yuzhang said to DeepTech, "We want to see if it is possible to make silicon work from cheap materials that are not nanoscale. This is very difficult, because large silicon particles will break during battery charging and discharging."

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